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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b4fa7d24c7dbd7cbe4667eca75bc0562bb25cedb28e618a1e441132cc4a9c1' 
  AND token = '9LNXcN0qJXS39JUgR8pMR/W/swr5fcLrMfPIwyapZGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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