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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '220a37a7a38d839c4c7618b7dd2175a2053905d17fb27dbdb42c6f93a7ead526' 
  AND token = '9hT0rEVril1Zzx1za4MI1ZFKd3tNqfx+Qa0kvdFesRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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