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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e6c96a37e2795b60cff93f5c8c1d9f0ac98d7c0bf339d44ad9ec0b31d1dba2' 
  AND token = '4Mn1Nw8vYqaEdMqLgD8Fg1A2Dl0jN11L8J8SojqGGF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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