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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abffe54d590083f3709930c923a7b005f470fd3635b88bb37b4dd41c9fe79ee7' 
  AND token = 'WI2TM7aDdfOwlEhZKSNXaLFp1GTabIxf/YE60rtflIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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