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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d27da38eed9a3d350795d0974c4f5900065a1dea3d25ceeff90d6861617cc0' 
  AND token = 'tydLwMT/Lei+jzhOF/zba4Yl1U1hrUSSHTQlfjgUeII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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