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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b2ffa03c3da952f0b969276e75788cb2375d20815c0c894522edee8c6660b30' 
  AND token = 'cmRVzudgI+9RB5SqBwH4rmt02UknonyyZe6xXZts19I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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