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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994a138d3cc62025eeca216744329aa74999682941830bfbbe5e94f820c498c6' 
  AND token = 'e5Z7evausBsFAee8FK62sP/rT6ePoDYTrBp9j/ZvDUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}