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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c804b7af2dd17be6fd0f8e6d70b827af6b575649c1c2f3d4c6a0debab74794' 
  AND token = 'z8siv2g/odarlMP/ZVJE6clO/apYhyQ/WhDsV8Xrx6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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