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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e802234365fe8e4503efc9a0ce94e1ccfbb6336ac80913d670ec1cee9b2aea9f' 
  AND token = 'x6LAka2nP8QX7ziR+wS8BkEOViBCe2CVr8jbjXzuBrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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