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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d5f7e845e46e1eb2488ac478e1e309b3edb6277ae5707192b545c9e8dc2188e' 
  AND token = 'K7VOgZBlikn6rtblmjNrbQy0X36XVIMaN+QQTctjs7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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