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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75884c4927413370ca2a669034bad791923ec810339c7de6c7bd08658b220db9' 
  AND token = 'FNL6JUegk1X4bp6UtiVgd6nbzP2KzPjwnSIO2wd3kwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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