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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbc7bab4712b2d3e74f41cc26b50e1bbe30088a6f634ed02bbd244070629a85' 
  AND token = 'oYcMWBKoVpyW3uBe0SA/WuVFzYAV2VedEis4ZELsY40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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