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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d0e432d943bfd40e70d3ce89e366ecb9ff1e245cd0513f399e3db52f8450d05' 
  AND token = 'bnAjkeECxvNF0HIZaQYCsa25vif8gssSW1vfG3ns18A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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