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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7b6d20870232555221f9f8be06ca2900d1d5b1763766bf516863a4ffb6e7e7' 
  AND token = '+ZKc89ALoCoAa2pPaLuwVv5rtilxsO2QCci/Bz56/3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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