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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58202291d556cdbb63fa66e28e98ea3b2059868e059281f6a75920cdcb7f5db2' 
  AND token = 'lD3/bNJL5FpGvLRYPBjMOh3lEPG0JpjeIr+9Y4mU2rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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