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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed7b246e601287e6c1c73b290103b0bdfd899ee371f5708a18f705c49662f5d9' 
  AND token = '1XvLLUYNoRwS3bgcLcPsrkzxyt+LrrB/dZEBEMZoVT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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