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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70601cde1738609033cbab0180938f9ee9a120f97a31c0bf1eb5450dff9d39e5' 
  AND token = 'nZKYErhjt7EgOOJ953MMe2Fw4JWG8fplnbuwHwcGeKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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