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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e7efe9343d06233ee06bcbf434aaa278e4f6ff40c98f51cd1529ef531015bd' 
  AND token = 'iJp/KW5vdYNA2qlzbnXxKyP528t+4ej69f59PA36RTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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