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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665836b5ebc3b946221942ad4fc49ec62ba68a3123c93932bb89424d1c8f44d3' 
  AND token = 'fO142UBF6kWKJyMIqkrR2XfDnCRDo0+nyUUVa8oCCQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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