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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07060f696f20109ce3d1235b373bbf481a7e84228fb362b8ba5ea05b06d684c4' 
  AND token = 'ZXj+arf6lFlBUFwxPnLSm+LF8TdiDuSUy4SthXzfsh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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