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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ca00c517ee44d28c95fb24cb42cdf7d041b6d5d3ee694c2bbc8bb8101e272f' 
  AND token = 'AOCKrkNE0Icrr9o4rSfV4kahwC7Mszrscy/x9lTcSp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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