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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02384b40742a3a09f9935f1d8adb0747fbfa2309e51b36ef404c45428aa0084e' 
  AND token = 'fH8GVvhS2f+HmQgFQPRDQO0Sa3+N4HfdjoGfomtqJkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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