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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9716539c1f595b34bff73337d3774cea14005b61992a2ed0fff89c929a450a83' 
  AND token = 'xFDmKOpsTMqB5dmNiLtLsnY3mO5Xxd1sWlhS8e/Spwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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