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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '029335ed0959ea75bbc6ecf4004ad8d15bfc9e7b093258e217c8376190324b2a' 
  AND token = 'vL/Gxbm9XoIRcyVDlGDlyzFqdF2EiTNSdN6IKioanT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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