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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a32ee55f49f6aa7e1c960ced80c3cf6d6625cb96df934e4412830f45d10368' 
  AND token = 'wcLkK3z8a41lyR+sZxGAR3HRtYybRE5IuC+qcXu77W4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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