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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b113917474134a3e59685f5de0b834f7a3e41f0b196703152dfaefe88675647c' 
  AND token = 'Tgi+EIZH58iEjEwKqILk/tLiT/hz7F41rWRopPdYsNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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