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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e0db69996bb02cb6ad3112dcb977d2bf9154ba8f9c8975a1e5d21873f09217' 
  AND token = 'kETT6RYh/9hkYAgR9bHJev3N5PFOy733sInhlwWZOuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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