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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbc21d7e4094cbdf1f23ee9107d5597aa35fb4811ab39e6245da5fdbcab0a19d' 
  AND token = 'MFUdzBH78j74+eYHPLETFNZomyU4W4M4cpy32kgOJL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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