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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '940f1e362302442a7c1c42fad280744891c9dafcd28483d8fb2df3438a6d335d' 
  AND token = 'lqZAh4sFna6Nn4QPLWDT2DseazUSeiOvd3CImh96I2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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