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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5260bd52f78ae186df34305815bac5e2317ad78d22d576f996ce825a72ec173a' 
  AND token = 'D/Q7LL8v4ANDbfM5o+M+D/PVMjqvJqR5ExM7jYcwm1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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