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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3c01ae2b2f2c97ae9ad88b1884b9c513c8c3a8ae31551c5d0eac601618e0a1' 
  AND token = 'sh5x/fcSXtoWr07BUGMznbSewzjVpi/357KR6FfEST4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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