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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9645ebd819416dfce0e4f9de828528d40253c71ce91a63a896ead37a0815ce' 
  AND token = 'xuIYN1Ua+CxibrfNZXprGP4d8FER+i45jmTW8ZRELuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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