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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb65b7d62c22a3f54110793f9a509ba499b1270d914cc08c6a99e4aeb5bd944' 
  AND token = 'bSf2qbIqN9yT6gwsE3szOUi8nLlS0QE/lcZr2T2XST0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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