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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '125c1e357add362fb8c2f19e23c3cc86e9c46dc8e8ffc8f40f0af9268799118e' 
  AND token = 'LnN+ZUMwWTaQwC5acS196uvSIMBI1ZCOT8sEVILtx4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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