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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f26e65d3791980dbb7570ca9b08547e529414dbb05dd4da58ae489e42d73114c' 
  AND token = 'gd+zl0nhXBCmfKjkg8MFWEawb/DnS6NAevTekuzARFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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