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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c716facfdd0f9145957a4e2cac7af39d7ad9f0198fff8a54b616e0e086b647f3' 
  AND token = '8irKaNSU8N5xQRMVan+MhDzRC5ae1/uCDo9A8EQq7p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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