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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693acf594a7a74994f1a18e77f5cdc7d892fb9e90bd5fba1c8618a9596223c58' 
  AND token = 'q5xJ+6AvwDCIcZx70AkI2HH0zxakLrVueH0ktnHHzRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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