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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a852215826bd83e94453de9a4643b50d9fe36001394bcd9e49f2306e38837991' 
  AND token = '/1alNwi+Q3zqVUyKigfwTz+kcPcx7kFamK35Npz0Xt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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