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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a90a636d8b35fa04d6afbb1770cbc2ee156be201752a850da99971e0c4cf188' 
  AND token = 'N6v1VGFCLk+OvI+fLueaX3sej856TDCQzpVz0DYP5Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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