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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204959396ecfef1ec679a63f9c0e61bae8047224d79235dbf6e8989b0ea6dae0' 
  AND token = 'aOIH2ob5dYpfCPsg84twpCtE1hdgtD1/w0z0bfutrMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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