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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51dedc5982f79f0ac019ffd663c7397a88acde35cdb08e8fa871c8cd9e56921a' 
  AND token = 'QNUPVBafmDN411nTvGrK+zxP3XYzNjLwiF6RMa5AOBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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