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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ed18e9072532bc96a5d02e3a1c554613cc11c82f1d1a8bac6301fd6c8a6791' 
  AND token = 'CL6Xlgth0zLIVNWPhLjveXM1cTNl5WWmG0/8aaGXUho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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