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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06ac4e70875219d4fe3fa13e3fb93601ceb89e0379428e8a9e6908dd64ea73b' 
  AND token = 'VtvfTfOA5OnUDMibegbin/5q9XEAj+HINl6VcZc51S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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