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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08bf6c8df5495a40b4b0bac64f0c2cd6ea211a8099c587b81711e272610d2e7' 
  AND token = 'JbNinBnKMR8w9rsid9gVi15gFpJgAEfgoB0FYTH5iIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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