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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8575474f97582e8a00c3ed901718131345c6dfe87e2117955c8a5b7e092bb0d2' 
  AND token = 'du+pbXSB06GMFUk+CO1XVviVY+KN9RLqBSGqUuOc0cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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