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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6ac95d0b253664b198c0611ba69501f67084b5340ecb86d8fa252c55fb617f' 
  AND token = '71Geqcwn07g2wx45hXMfPphFrOkfuTmON2WsqmReKZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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