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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f8b22d2db0064b6e2ada9d8965880028d419b6588486c682ebe5e25e0346bc' 
  AND token = 'mHm5+5TR/mJArG0josvWqcU8GY8TxRAitX88AruvY5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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