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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20305d923894b3d007d7966cfbe10dc7bff657ac2da953f756140aa9d55f5f2' 
  AND token = 'k3gl4hb3s8OZJF9hAD6io1a+QsHVto4EnU7afdpde/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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