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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10058d5ffc10e044565b554b2e33669d2f204b69a024431e28ca2561b8f639d' 
  AND token = 'YDIwOHzxilF30wqTTI0pDbZvP2PhevPaB+MPErLofkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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