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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa0679c641a101309c1f20c0a0e166abb33f56ed1c25dfc4677f43c890ce1e8' 
  AND token = 'PCXv5mgReodQnXmTQ3I2R/NmUKLEIFU8RWZeHeprpuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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