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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d27ff28a07f2fe41bdb18953ac8b7fb1237e22b6f1425d1aecad25a7f4e422a' 
  AND token = 'YQG8JjwnJAh2oi2FTzpxMsajB1866aMaa9bsgm1U3j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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