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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7774967f8a12c902c12369eef6d5b5cfed1978261414bf51c09bbfc64ae7cd64' 
  AND token = 'co79ZpwpzUkTrpBfV1CXygdWR0mGxuohWV8timnWKYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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