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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75398769a11a5e751d9478f292a02374e5eb1154c2882f59cad7cf94632ba55e' 
  AND token = 'G2kyB4JWXokuxsaN++bsJx65x290XqFph9HNyyJQ0sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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