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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec4515b9a75e43ea64ee3501ca62902b8c7a389a6ebce4264e80c1d440e3d985' 
  AND token = 'eD6qp0qk2B/S82IoPrnahijmYeJTcU+69t9U44Dvzek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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